
div.tree div.menu-item{
	display:flex;
	display:-webkit-flex;
	align-items: center;
	margin:1px 0;
}
/* 父子节点给不同的背景色 */
div.tree div.father{
	background-color:#2898cc;
}
div.tree div.child{
	background-color:#ccc;
}
div.tree a{
	color:black;
	text-decoration:none;
}
div.tree a:hover{
	color:#0c24dc;
}
div.tree i.menu-icon{
	display:inline-block;
	width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-left: 8px solid #636060;
    border-bottom: 6px solid transparent;
    margin-right:0.3em;
    transition: transform 0.1s linear;
    -webkit-transition: transform 0.1s linear;
}
i.expland-icon{
   transform: rotate(90deg);
   -webkit-transform: rotate(90deg);
}

